On the Measurement of the Stiffness of Spin Waves in the Fe0.75Co0.25Si Helimagnet by the Small-Angle Neutron Scattering Method

被引：4

作者：

Grigoriev, S. V. ^{[1
,2
,3
]}

Pshenichnyi, K. A. ^{[1
,2
,3
]}

Altynbaev, E. V. ^{[1
,2
,3
]}

Siegfried, S. -A. ^{[4
]}

Heinemann, A. ^{[4
]}

Honnecker, D. ^{[5
]}

Menzel, D. ^{[6
]}

机构：

[1] Natl Res Ctr Kurchatov Inst, Petersburg Nucl Phys Inst, Gatchina 188300, Russia

[2] St Petersburg State Univ, St Petersburg 198504, Russia

[3] Russian Acad Sci, Inst High Pressure Phys, Moscow 108840, Russia

[4] Helmholtz Zentrum Geesthacht, D-21502 Geesthacht, Germany

[5] Inst Laue Langevin, F-38042 Grenoble, France

[6] Inst Phys Kondensierten Materie, D-38106 Braunschweig, Germany

来源：

JETP LETTERS | 2018年 / 107卷 / 10期

基金：

俄罗斯科学基金会;

关键词：

ITINERANT FERROMAGNET MNSI; DYNAMICS; EXCITATIONS;

D O I：

10.1134/S0021364018100107

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The stiffness of spin waves in the Fe0.75Co0.25Si helimagnet with the Dzyaloshinskii-Moriya interaction in a state fully magnetized by an external field has been measured by the small-angle neutron scattering method. It has been shown that the dispersion of magnons in this state is anisotropic because the neutron scattering pattern consists of two circles for neutrons with obtaining and losing the magnon energy, respectively. The centers of the circles are shifted by the momentum transfer oriented along the applied magnetic field H and equal to the wave vector of the spiral +/- k (s) measured in inverse nanometers. The radius of the circles is directly related to the stiffness of spin waves and depends on the magnitude of the magnetic field. It has been shown that the stiffness of spin waves A for the helimagnet is equal to 46.0 meV (2) at T = 0 K and decreases weakly (by 20%) with increasing temperature up to the critical value T (c) = 38 K.

引用

页码：640 / 645

页数：6

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